/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.grails.orm.hibernate.cfg;

import java.lang.reflect.Field;

import org.hibernate.cfg.Configuration;
import org.hibernate.id.SequenceGenerator;
import org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory;

import org.springframework.util.ReflectionUtils;

/**
 * Hibernate IdentifierGeneratorFactory that prefers sequence-identity generator over sequence generator
 *
 * @author Lari Hotari
 */
public class GrailsIdentifierGeneratorFactory extends DefaultIdentifierGeneratorFactory {
    private static final long serialVersionUID = 1L;

    @Override
    public Class getIdentifierGeneratorClass(String strategy) {
        Class generatorClass = super.getIdentifierGeneratorClass(strategy);
        if ("native".equals(strategy) && generatorClass == SequenceGenerator.class) {
            generatorClass = super.getIdentifierGeneratorClass("sequence-identity");
        }
        return generatorClass;
    }

    public static void applyNewInstance(Configuration cfg) throws IllegalArgumentException, IllegalAccessException {
        Field field = ReflectionUtils.findField(Configuration.class, "identifierGeneratorFactory");
        field.setAccessible(true);
        field.set(cfg, new GrailsIdentifierGeneratorFactory());
    }
}
